| 摘要 |
PROBLEM TO BE SOLVED: To properly return a refrigerating machine oil to a compressor, in an ejector type refrigeration cycle including an ejector in which a gas-liquid separation space is constituted integrally with the ejector.SOLUTION: An oil return passage 31f for guiding a part of a liquid-phase refrigerant in which a refrigerating machine oil separated in a gas-liquid separation space 30f is melted, from a gas-liquid separation space 30f side to a suction side of a compressor 11 is formed in a body portion 30 of an ejector module 13. When an operation condition is a low pressure operation condition in which a differential pressure ΔP obtained by subtracting a low pressure-side refrigerant pressure Ps from a high pressure-side refrigerant pressure Pd of a cycle becomes a first reference differential pressure KΔP1 or less, a refrigerant discharge capacity of the compressor 11 is set to be a reference discharge capacity or more. Thus, the refrigerating machine oil can be properly returned to the compressor, and degradation of durability life of the compressor 11 due to shortage of the refrigerating machine oil can be suppressed.SELECTED DRAWING: Figure 1 |
